Merriam-Webster Collegiate Dictionary - polypody

 noun  (plural -dies)  Etymology: Middle English polypodie, from Latin polypodium, from Greek polypodion, from poly- + pod-, pous foot — more at foot  Date: 14th century any of a genus (Polypodium) of chiefly epiphytic ferns with creeping rhizomes; especially either of two ferns (P. vulgare of Eurasia and P. virginianum of North America) with relatively narrow entire segments